EP0511796B1 - Synchronous motor with two permanent magnet rotor portions - Google Patents

Synchronous motor with two permanent magnet rotor portions Download PDF

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Publication number
EP0511796B1
EP0511796B1 EP92303735A EP92303735A EP0511796B1 EP 0511796 B1 EP0511796 B1 EP 0511796B1 EP 92303735 A EP92303735 A EP 92303735A EP 92303735 A EP92303735 A EP 92303735A EP 0511796 B1 EP0511796 B1 EP 0511796B1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
rotor
stator
phase difference
magnetic field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92303735A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0511796A1 (en
Inventor
Toshihiko Satake
Yukio Onogi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Satake Engineering Co Ltd
Satake Corp
Original Assignee
Satake Engineering Co Ltd
Satake Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Satake Engineering Co Ltd, Satake Corp filed Critical Satake Engineering Co Ltd
Publication of EP0511796A1 publication Critical patent/EP0511796A1/en
Application granted granted Critical
Publication of EP0511796B1 publication Critical patent/EP0511796B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/46—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
    • H02P1/50—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor by changing over from asynchronous to synchronous operation

Definitions

  • the present invention relates to an induction synchronous motor of a permanent magnet type which starts by the induction motor action and is brought into a synchronous operation by permanent magnets.
  • a conventional motor of the kind to which the present invention relates is a synchronous motor having a brushless configuration.
  • a unitary rotor comprises a squirrel cage type conductive portion of the induction motor and a rotor portion of permanent magnets.
  • the motor starts by the magnetic induction action produced between the rotating magnetic field of the stator and the squirrel cage type conductive portion of the induction motor and, when the rotating speed accelerates from the asynchronous speed of the induction motor and approaches the synchronous speed, that is, when the slip approaches zero, the rotating magnetic field of the stator and the magnetic poles of the permanent magnets attract each other thereby changing the motor speed to its synchronous speed.
  • the motor starts by the magnetic induction action between the rotating magnetic field of the stator and the squirrel cage type conductor portion of the induction motor.
  • the squirrel cage type conductive portion to have a magnetic induction action fully sufficient to overcome the starting interference caused by the simultaneous attraction and repulsion between the permanent magnets and the rotating magnetic field of the stator during the asynchronous speed operation.
  • the squirrel cage type conductive portion of the induction motor is required to be sufficiently large to overcome and to make negligible the starting interference of the permanent magnet rotor.
  • the synchronous torque which is inherently required depends on the size of the permanent magnets.
  • the permanent magnets In order to enable the starting torque of the induction motor to be sufficiently large to overcome the action of the permanent magnets, it has been required that the permanent magnets be kept small. For this reason, in comparison of the size of the motor with its output, a brushless synchronous motor of a permanent magnet type has remained large in size.
  • the brushless induction motor of a permanent magnet type as explained above is often used in recording or reproduction devices of small sizes in which WOW is particularly undesired.
  • the problems as explained above place limits to making such devices more compact so that there is a demand and desire for the realization of a synchronous motor which is small in size but its output remains large.
  • a drive motor having a combined asynchronous squirrel-cage rotor and a permanent-magnet synchronous rotor is disclosed in GB-A-2125229.
  • an object of the invention to overcome the problems existing in the conventional synchronous motor and to provide an improved synchronous motor having two permanent magnet rotor portions, in which any starting interference caused by the permanent magnet rotor portions is made negligible due to the cancellation action.
  • a synchronous motor comprising: a unitary rotor which has a first rotor portion formed by a first permanent magnet and a second rotor portion formed by a second permanent magnet and an induction type rotor, the first rotor portion and the second rotor portion being mounted on a common rotary axle with a predetermined, space being provided therebetween; a first stator which surroundingly faces the first rotor portion for producing a first rotating magnetic field around the first rotor portion; a second stator which surroundingly faces the second rotor portion for producing a second rotating magnetic field around the second rotor portion, the second stator being disposed so that, at the starting operation, the attracting action or the repelling action produced between the first rotating magnetic field and the first permanent magnet is canceled by the repelling action or the attracting action produced between the second rotating magnetic field and the second permanent magnetic; and a phase-changing means which is associated with either one of the first and second stators and which sets a phase difference between the first rotating magnetic
  • the positions of the first permanent magnet and the second permanent magnet on the common rotary axle are such that the respective central positions of the two permanent magnet poles coincide with each other at the same relative position of the rotor.
  • a phase-changing means may be constituted by switches by which connections between each terminal of stator windings of one of the two stators and a power source are switched to their opposite polarities or directions.
  • the motor starts as an ordinary induction motor by the magnetic induction action produced between the induction type rotor constituting the other part of the second rotor portion and the second rotating magnetic field.
  • Fig. 1 shows a side sectional view of a synchronous motor according to the invention
  • Fig. 2 shows a side sectional view of a rotor which is seen from the axial center of the rotor from the side of a squirrel cage rotor and which is shown in partially broken sections.
  • the rotor has a first rotor portion formed by a rotor 2 of a permanent magnet and a second rotor portion formed by a rotor 4 of a permanent magnet and a squirrel cage type rotor 5, all of which are unitarily mounted on a rotary axle with a space being provided between the permanent magnet rotor 2 and the permanent magnet rotor 4.
  • the number of poles of the rotor 2 formed by the permanent magnet and that of the rotor 4 also formed by the permanent magnet is the same.
  • the centers of the magnetic poles of respective permanent magnets coincide with each other at their relative positions but this coinciding arrangement is not limitative.
  • the squirrel cage type rotor 5 constituting a part of the second rotor portion is formed by an arrangement wherein a plurality of rotor conductors 7 are provided on the outer periphery of a rotor core 6 formed by laminated steel members and both the ends of the rotor conductors 7 are respectively short-circuited by short-circuit rings 8. It is also possible to use a wound-type rotor instead of the squirrel cage type rotor 5.
  • the unitary rotor formed in the manner as explained herein is rotatably carried by bearings 17a, 17b provided in frames 16a, 16b. These frames 16a, 16b are fixed together by bolt and nut members 18.
  • stator 10 having stator windings 9 is provided on the inner peripheral wall of the frame 16a for the permanent magnet rotor 2 constituting the first rotor portion.
  • stator 14 having stator windings 13 is provided on the inner peripheral wall of the frame 16b for the second rotor portion.
  • the stator 14 acts magnetically both with the permanent magnet rotor 4 and the squirrel cage type rotor 5 which constitute the second rotor portion.
  • Fig. 3 shows an example of wire connections between the stator windings 9 and the stator windings 13 and also wire connections to three-phase power sources R, S and T.
  • the stator windings 9, 13 are connected in parallel to the three-phase power sources but they can be connected in series.
  • the stator windings 9 of the stator 10 are provided with the phase-changing means 21 by which the phase of the rotating magnetic field produced by that stator 10 around the first rotor portion is phase-shifted by 180 degrees through the simultaneous switching of switches 20.
  • This phase-changing means 21 also functions such that the phase difference of 0 degree or 180 degrees may selectively be produced between the rotating magnetic field produced around the first rotor portion by the one stator 10 to which the phase-changing means is provided and the rotating magnetic field produced around the second rotor portion by the other stator 14.
  • the phase-changing means 21 is so arranged that the phase difference becomes 0 degree when the contact point of each of the switches 20 is at A-side and becomes 180 degrees when the same is at B-side.
  • the starting of the motor is to be effected at the phase difference of 0 degree with the contact point of each switch 20 of the phase-changing means 21 being at A-side and subsequently switched to the phase difference of 180 degree with the contact point at B-side or, on the contrary, the starting of the motor is to be effected at the phase difference of 180 degrees and subsequently switched to 0 degree with the contact point at A-side, depends on whether the center of the magnetic pole of the permanent magnet 2 constituting the first rotor portion and the center of the magnetic pole of the permanent magnet 4 constituting a part of the second rotor portion coincide with each other in opposite polarities or coincide with each other in the same polarity in their relative positions.
  • Fig. 4A shows that the centers of the magnetic poles of the permanent magnets 2, 4 coincide with each other in the opposite polarities.
  • the starting of the motor is effected at the phase difference of 0 degree with the contact point of each switch of the phase-changing means 21 being at A-side and subsequently, as the rotation speed accelerates and the slip approaches 0 (zero), the contact point is switched to B-side for 180 degrees whereupon the motor operates at the synchronous speed.
  • the rotor in which the centers of the magnetic poles of the permanent magnets 2, 4 coincide with each other in the opposite polarities, explanation is made hereinafter on the operation relating to the switching from the starting operation to the synchronous operation.
  • the phase difference between the rotating magnetic field produced by the stator 10 and the rotating magnetic field produced by the stator 14 is 0 degree, so that the magnetic polarities of the two stators at the same relative position always become the same polarity (e.g., N-pole and N-pole or S-pole and S-pole). Therefore, as shown in Fig. 4A, assuming that, at the starting of the motor, the rotating magnetic field of the one stator 10 and the permanent magnet 2 faced by the stator 10 are in their attracting state at N-pole and S-pole , the rotating magnetic field of the other stator 14 and the permanent magnet 4 faced by this stator 14 are in the repelling state at N-pole and N-pole.
  • the starting operation is unaffected by the permanent magnets 2, 4 and the motor operates as an induction motor by the magnetic induction action produced between the rotating magnetic field of the stator 14 and the squirrel cage type rotor 5.
  • the permanent magnets 2, 4 do not have any influence to the starting action of the squirrel cage type rotor 5
  • the phase difference between the rotating magnetic field produced by the stator 10 and the rotating magnetic field produced by the stator 14 is made 180 degrees.
  • the momentary polarities of the two stators 10 and 12 at the same relative position are always opposite to each other, that is, they are S-pole and N-pole.
  • the respective N-pole and S-pole of the permanent magnet rotors 2 and 4 and the rotating magnetic fields attract each other thereby allowing the permanent magnet rotors 2 and 4 to enter into the synchronous operation.
  • the squirrel cage type rotor 5 is rotating at the same speed as the rotating magnetic field produced by the stator 14, no magnetic induction action exists between them and the synchronous operation is not affected thereby.
  • any starting interference which may otherwise be caused by the presence of the permanent magnet rotors is made negligible so that the squirrel cage type rotor may be designed with only the starting torque taken into account.
  • the squirrel cage type rotor can be made small in size as compared with that in the prior art arrangement.
  • the permanent magnet rotors since there is no need to take into account any such starting interference as present in the prior art arrangement, it is possible for the permanent magnet rotors to be designed proportional to the required synchronous torque whereby the synchronous torque can be increased.
  • the synchronous motor according to the present invention is started by the induction motor, so that it is possible to utilize a power source which is used in an ordinary induction motor. That is, the power source may be an AC power source of a commercial frequency or a variable frequency power supply utilizing an invertor.
  • the phase may either be a single phase or multiple phases.
  • the magnetic poles of the permanent magnet rotors 2 and 4 at the same relative position may be disposed in such a way that the poles of the same polarity oppose to each other, that is, the N-pole and the S-pole of the permanent magnet 2 and the N-pole and the S-pole of the permanent magnet 6 respectively oppose to each other.
  • the principles of the starting of the motor and of the bringing of the operation into a synchronous operation and the operational characteristics obtained in this embodiment are the same as those already explained with reference to Figs. 4A - 4C.
  • the phase-changing means 21 has been explained as being constituted by the switches 20 but it is possible for this to be a rotatable stator type wherein one of the two stators is allowed to be rotatably displaced with respect to the other of the two stators.
  • the motor does not require a starter or brushes thereby allowing the configuration of the motor to be simpler. Also, since the motor can start with the same torque characteristics as in the conventional induction motor, it is possible for the motor to start even under a loaded condition and continue on to the synchronous operation.
  • the squirrel cage type rotor may be designed with only the starting torque taken into account.
  • the permanent magnets which do not cause the starting interference to occur allow the designing of the permanent magnet rotors to be proportional to the required synchronous torque. This means in effect that the synchronous motor thus realized is one which can be small in its size but which can produce a large torque.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
EP92303735A 1991-04-27 1992-04-24 Synchronous motor with two permanent magnet rotor portions Expired - Lifetime EP0511796B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP125507/91 1991-04-27
JP3125507A JP3063229B2 (ja) 1991-04-27 1991-04-27 同期電動機

Publications (2)

Publication Number Publication Date
EP0511796A1 EP0511796A1 (en) 1992-11-04
EP0511796B1 true EP0511796B1 (en) 1995-02-08

Family

ID=14911841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92303735A Expired - Lifetime EP0511796B1 (en) 1991-04-27 1992-04-24 Synchronous motor with two permanent magnet rotor portions

Country Status (12)

Country Link
US (1) US5281879A (da)
EP (1) EP0511796B1 (da)
JP (1) JP3063229B2 (da)
KR (1) KR100247210B1 (da)
AU (1) AU652822B2 (da)
CA (1) CA2067022C (da)
DE (1) DE69201354T2 (da)
DK (1) DK0511796T3 (da)
FI (1) FI921860A (da)
MY (1) MY106660A (da)
NO (1) NO921597L (da)
TW (1) TW199243B (da)

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AU704814B2 (en) * 1994-06-08 1999-05-06 Precise Power Corporation Versatile AC dynamo-electric machine
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FR2937476B1 (fr) * 2008-10-22 2010-12-03 Leroy Somer Moteurs Machine hybride comportant un moteur synchrone et un moteur asynchrone
KR101018715B1 (ko) 2008-10-28 2011-03-04 한국전기연구원 유도전동기의 회전자 및 그 제조 방법
WO2010051691A1 (zh) * 2008-11-05 2010-05-14 鹤山市鹤龙机电有限公司 一种小型直驱永磁同步风力发电机及其小型风力发电系统
CN102882339A (zh) * 2012-09-17 2013-01-16 黄克玉 带永久磁铁的交流发电机
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JP6302698B2 (ja) * 2014-02-14 2018-03-28 本田技研工業株式会社 回転電機ユニット
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Also Published As

Publication number Publication date
AU652822B2 (en) 1994-09-08
MY106660A (en) 1995-07-31
US5281879A (en) 1994-01-25
DE69201354T2 (de) 1995-05-24
NO921597D0 (no) 1992-04-24
DE69201354D1 (de) 1995-03-23
DK0511796T3 (da) 1995-05-01
FI921860A0 (fi) 1992-04-24
AU1521592A (en) 1992-10-29
EP0511796A1 (en) 1992-11-04
CA2067022A1 (en) 1992-10-28
NO921597L (no) 1992-10-28
CA2067022C (en) 2000-01-11
KR920020809A (ko) 1992-11-21
JPH04331448A (ja) 1992-11-19
TW199243B (da) 1993-02-01
KR100247210B1 (ko) 2000-04-01
JP3063229B2 (ja) 2000-07-12
FI921860A (fi) 1992-10-28

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